Donaldson Company, a worldwide manufacturer of filtration systems and parts, announced that the company received Level 3 Plus conditional verification by the California Air Resources Board (ARB) in October 2011 for an off-road emissions retrofit device. The approval is for the Donaldson Non Road Low NO2 Filter (NR-LNF Muffler) applicable to off-road engines produced from 1996 to 2010 with power ranges from 100 to 600 hp.
